Streamlabs API v2.0 捐赠接口调用返回401未授权问题求助

我最近在做第三方捐赠服务和Streamlabs的集成，想通过调用Streamlabs的捐赠接口，把外部的捐赠记录同步到Streamlabs后台里。照着思路写了Python代码，但折腾了两个小时，不管怎么调试都一直收到401未授权的错误，实在找不到问题出在哪，来求助各位大佬！

我的代码如下：

import requests
import datetime

API_ACCESS_TOKEN = "MY API ACCESS TOKEN"
# FROM https://streamlabs.com/dashboard#/settings/api-settings

url = "https://streamlabs.com/api/v2.0/donations"

headers = {
    "accept": "application/json",
    "Authorization": f"Bearer {API_ACCESS_TOKEN}",
    "Content-Type": "application/json"
}

# Donation data (replace with actual values)
donation_data = {
    "name": "John Doe",
    "message": "Thanks for the stream!",
    "identifier": "john.doe@example.com",
    "amount": 10.00,
    "currency": "USD",
    "created_at": datetime.datetime.now().isoformat(),
}

if __name__ == '__main__':
    response = requests.post(url, headers=headers, json=donation_data)

    if response.status_code == 200:
        print("Donation created successfully!")
        print(response.text)
    elif response.status_code == 400:
        print("Error creating donation:")
        print(response.text)
    else:
        print(f"Unexpected status code: {response.status_code}")
        print(response.text)

运行后得到的错误信息是：

Unexpected status code: 401
Unauthorized.

我已经确认过API访问令牌是从Streamlabs后台的API设置页面获取的，但就是一直报未授权，有没有朋友遇到过类似的问题，或者能帮我看看代码里哪里有问题吗？

备注：内容来源于stack exchange，提问作者ThunderHorn